Vertical axis helical wind turbine



FIG. 1 is a front view of our vertical axis helical wind turbine;

FIG. 2 is a left view;

FIG. 3 is a back view;

FIG. 4 is a right view;

FIG. 5 is a top view; and,

FIG. 6 is a bottom view. 

CLAIM The ornamental design for a vertical axis helical wind turbine, as shown and described. 